THE EFFECT OF CEMENT THICKNESS AND PREPARATION DESIGN ON STRESS LEVEL AND STRESS DISTRIBUTION IN MAXILLARY CENTRAL INCISOR RESTORED BY LAMINATE VENEERS- A FINITE ELEMENT ANALYSIS
Journal Title: Journal of Evolution of Medical and Dental Sciences - Year 2019, Vol 8, Issue 10
Abstract
BACKGROUND Laminate veneers have been introduced as a successful and reliable technique for treating malformed, yellow, or chipped teeth. However, mechanically speaking, their success is questionable. The main reason for the failure of laminate veneer treatments is their fracture. The present study aims at improving the mechanical features of laminate veneers by investigating the factors affecting the success of this treatment through a finite element analysis (FEA). MATERIALS AND METHODS For assessing the distribution in the laminate veneer of maxillary central incisor under different clinical conditions, first a healthy natural maxillary central incisor was prepared, and it was scanned by a 3D Scanner. Then, Window finish line design was defined virtually in the software; feathered incisal edge and overlapped incisal edge were defined virtually. The scanned tooth was modelled in SOLIDWORKS 2015, and it was then entered into ABAQUS FEA which is an analytical software. Finally, the maximum stress tolerated in each of these conditions as well as the stress level distribution were recorded and described in different points of laminate veneers. RESULTS The present results showed that in comparison with other preparation designs, Window preparation design creates more tension in the teeth. Moreover, according to the findings obtained from the finite element analysis, overlapped incisal edge preparation creates the most tension in porcelain. In all kinds of preparations, the amount of tension imposed on the cement was significantly less than the tension imposed on teeth and porcelain. CONCLUSION It can be concluded that, the preparation, cement thickness, and the angle of the forces applied will significantly change the maximum internal tension of teeth, porcelain, and the related cement.
Authors and Affiliations
Shima Ghasemi, Amir Reza Babaloo, Sahar Negargar, Sohrab Amini
Keywords
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- EP ID EP555305
- DOI 10.14260/jemds/2019/157
- Views 75
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